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Fair Value Measurements - Fair Value by Balance Sheet Grouping (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Sep. 30, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, at fair value $ 2,572,709 $ 1,995,097
Held-to-maturity securities 436,972 423,586
FHLB stock 95,617 126,820
Carrying Amount    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, at fair value 2,572,709 1,995,097
Held-to-maturity securities 436,972 423,586
Carrying Amount | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents 2,381,102 980,649
Carrying Amount | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
FHLB stock 95,617 126,820
Time deposits 9,556,785 5,305,016
Borrowings 3,267,589 3,650,000
Carrying Amount | Level 2 | Client swap program hedges    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other assets 46,758 78,797
Other liabilities 47,388 79,668
Carrying Amount | Level 2 | Commercial loan fair value hedges    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other assets 1,595 3,405
Carrying Amount | Level 2 | Mortgage loan fair value hedges    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other assets 0 46,396
Other liabilities 667 0
Carrying Amount | Level 2 | Borrowings cash flow hedges    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other assets 117,271 184,373
Carrying Amount | Level 2 | U.S. government and agency securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, at fair value 314,204 217,053
Carrying Amount | Level 2 | Asset-backed securities due    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, at fair value 540,125 588,016
Carrying Amount | Level 2 | Municipal bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, at fair value 35,073 34,662
Carrying Amount | Level 2 | Corporate debt securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, at fair value 296,282 242,522
Carrying Amount | Level 2 | Agency pass-through certificates    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, at fair value 1,387,025 912,844
Held-to-maturity securities 436,972 423,586
Carrying Amount | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans receivable 20,916,354 17,476,550
Carrying Amount | Level 3 | Junior subordinated deferrable interest debentures    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Borrowings 50,718 0
Estimated Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, at fair value 2,572,709 1,995,097
Held-to-maturity securities 401,046 355,188
Estimated Fair Value | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents 2,381,102 980,649
Estimated Fair Value | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
FHLB stock 95,617 126,820
Time deposits 9,787,187 5,232,689
Borrowings 3,276,122 3,653,229
Estimated Fair Value | Level 2 | Client swap program hedges    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other assets 46,758 78,797
Other liabilities 47,388 79,668
Estimated Fair Value | Level 2 | Commercial loan fair value hedges    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other assets 1,595 3,405
Estimated Fair Value | Level 2 | Mortgage loan fair value hedges    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other assets 0 46,396
Other liabilities 667 0
Estimated Fair Value | Level 2 | Borrowings cash flow hedges    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other assets 117,271 184,373
Estimated Fair Value | Level 2 | U.S. government and agency securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, at fair value 314,204 217,053
Estimated Fair Value | Level 2 | Asset-backed securities due    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, at fair value 540,125 588,016
Estimated Fair Value | Level 2 | Municipal bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, at fair value 35,073 34,662
Estimated Fair Value | Level 2 | Corporate debt securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, at fair value 296,282 242,522
Estimated Fair Value | Level 2 | Agency pass-through certificates    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, at fair value 1,387,025 912,844
Held-to-maturity securities 401,046 355,188
Estimated Fair Value | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans receivable 20,269,059 16,559,758
Estimated Fair Value | Level 3 | Junior subordinated deferrable interest debentures    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Borrowings $ 50,240 $ 0